textproduct: Rapid City

KEY MESSAGES

- Chilly tonight. Patchy frost possible late across portions of the northeastern WY plains.

- Mostly dry with warming temperatures through mid week. Windy Monday and Wednesday.

DISCUSSION

(This Evening Through Saturday) Issued at 212 PM MDT Sat Jun 13 2026

Water vapor imagery shows cyclonic flow across the central/eastern CONUS...with northwest flow across the region and a shortwave crossing the CWA at this time. KUDX radar the band of drizzle/rain gradually weakening over the last two hours. Far northeast WY, where the rain lingered longest this morning, had the most QPF with totals of 0.30-0.60". Northwest winds continue at the surface behind a cold front that passed earlier today. Temps have been very cool for mid June...generally 50s and 60s, though some parts of the northeast WY plains were in the mid to upper 40s. Surface high pressure will build across the CWA for Sunday and Monday bringing quiet weather to the northern Plains. Chilly temperatures are in store for tonight and Sunday morning. Widespread 30s are expected across the Black Hills...even some 20s across the highest elevations. Portions of the northeastern WY plains may also see temps dip into the 30s...even approaching the mid 30s. Could see a few spots of frost develop mainly across sheltered location along the Belle Fourche River valley. The areal coverage is much too limited for any frost headlines at this time, especially with how early the run rises this time of year. As mentioned, dry weather is expected the next couple of days. However, with northwest flow aloft with embedded shortwaves persisting across the region, could see some breezy winds on Monday. A strong shortwave is progged to cross the Dakotas late Tuesday into Wednesday. This could bring strong winds to the area on Wednesday with gusts to advisory or warning thresholds. Showers and thunderstorms will also be possible with this wave, but the bulk of the QPF could stay north and east of the forecast area.

AVIATION

(For the 18Z TAFS Through 18Z Sunday) Issued At 1116 AM MDT Sat Jun 13 2026

Showers continue to move southeast through far northeast WY and western SD. MVFR conditions will exit these areas over the next few hours, after which VFR cigs are expected. Western SD may see gusty winds (30kts) this afternoon, but these will subside tonight.

UNR WATCHES/WARNINGS/ADVISORIES

SD...None. WY...None.